North Mountain (French: Montagne du Nord; Gaelic: Beinn a Tuath) is a narrow southwest-northeast trending volcanic ridge on the mainland portion of southwestern Nova Scotia, stretching from Brier Island to Cape Split.

The ridge traces its history to the Triassic period when this part of Nova Scotia occupied the center of the supercontinent Pangaea.

[2] It is a portion of the Central Atlantic Magmatic Province, which is a gigantic flood basalt and intrusive complex along east coast of the United States, Europe, northwest Africa and South America with a diameter of 4,000 km.

A viscous (<175 m) North Mountain flow at McKay Head shows ~25-cm-thick distinguished layers separated by ~130 centimeter of basalt in its upper 34 meters.

Upper layers (5 meters below the lava top) are extremely vesicular while lower ones are pegmatitic and include a narrow (~2 cm) rhyolite band.